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Pleistocene volcanism and shifting shorelines at Lake Tahoe, California

A recently-published study co-authored by two CalVO scientists brings attention to the role that lava dams played in shaping Lake Tahoe.

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USGS volcanologists conduct volcanic crisis training in Chester, CA

It isn't often that scientists and land managers spend two entire days together talking about volcanoes outside of an eruptive crisis, but a special...

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Subsurface Magma Triggers Earth’s Most Severe Extinction

Subsurface magma intrusions (sills), rather than surface lava flows, may have triggered the Earth’s most catastrophic extinction event approximately...

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Explore California's volcanic legacy and future with new field trip guides

California is well-known for its frequent earthquakes, but less so for its volcanic history – despite the fact that the most recent eruption in the...

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New ages confirm that the youngest Eagle Lake volcanic rocks erupted 130-125 thousand years ago

New research on the ages of the most recent lava flows at Eagle Lake Volcanic Field, California suggest they are much older than once thought...

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New scientific publications about our California Volcanoes by USGS authors

Two new journal articles about California Volcanoes in the eastern part of the state, the Long Valley Caldera and Ubehebe Craters, are headed to press...

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Volcano Watch — Exploring USGS volcano observatories—Part 3: California

This month, our Volcano Watch articles are exploring U.S. Geological Survey (USGS) volcano observatories and their connections to Hawai‘i. This week...

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Strong Earthquakes near CA-NV border

Three jolting earthquakes occurred in the wee hours this morning near Hawthorne NV, with two M5.7 events and a M5.5 occurring between the hours of 12...

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Short-lived Long Valley earthquake swarm does not indicate heightened volcanic unrest

A short-lived earthquake swarm occurred overnight under the Long Valley Caldera in eastern California about 4 km (2.5 mi) ESE of the town of Mammoths...

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CalVO Scientists Present Work at International 2016 AGU Fall Meeting

Fifteen CalVO scientists will present work this week at the 2016 American Geophysical Union Fall Meeting, held in San Francisco, California.

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Volcanic hazards in the long term: 3rd Volcano Observatory Best Practices (VOBP) workshop

Volcanologists from volcano observatories around the world met at the international Volcano Observatory Best Practices Workshop in Vancouver...

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Earthquake swarm near Salton Buttes is not volcanic

An earthquake swarm started on 26 Sep 2016, 04:03AM PDT, and is ongoing in the Brawley Seismic Zone near the southern terminus of the San Andreas...

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